I had this same issue and found your question. Well I figured it out. Go into either the web interface or the menu system and set SMTP/POP to OFF. The e-mail will error out within 10 minutes. Then turn the SMTP/POP feature back on.
In the web interface,
Network Settings
POP3/SMTP
Tick POP3/SMTP to OFF
Let the send error out within 10 minutes.
Tick POP3/SMTP back to ON.
Solved!
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i have the same error as above. anyone with advice
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